Anything

This blog describes anything about @mrkn's thoughts, which includes computer programming (mostly Ruby, Haskell, and C++), mathematics, physics, and so on. Each article is written in English for learning it.

I make a patch to modify it so that a literal of decimal fraction without its exponent part is instantiated as a Rational.

The reason why I wrote this patch is that I think most Rubyists don't need to use Float values. Correct use of Float values is difficult for many people, especially most of Rubyists, who aren't well acquainted with floating-point number arithmetic. I want to realize the world that nobody is in trouble with floating-point errors.

I will talk about such a topic in RubyConf 2011. The talk is titled "Float is Legacy". I've got this title from Ujihisa. I love this title.

2009-12-18

When debugging ruby on gdb, we often want to expand some preprocessor macros, such as RSTRING_LEN, RARRAY_PTR. To make preprocessor macros available to gdb, we should call gcc with these debugging options: -gdwarf-2 -g3.